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Suppression of Meloidogyne hapla populations by Hirsutella minnesotensis

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The effects of the endoparasitic fungus Hirsutella minnesotensis on populations of Meloidogyne hapla from Michigan (MI), Rhode Island (RI), Connecticut (CT), Lyndonville, New York (NYL), Geneva, New York (NYG), and Wisconsin (WI) were studied in the greenhouse. Twenty-day-old tomato (cv. Rutgers) seedlings were inoculated with either 0 or 600 eggs of each nematode population mixed with either 0, 0.02, or 0.1g of fresh H. minnesotensis mycelium 0.1L −1 of soil in pots containing 0.5L of soil, and maintained at 25±2°C for 2 months. No effect of the fungal treatments and nematode treatments on tomato plant heights and shoot dry weights was observed. While all M. hapla populations were suppressed by H. minnesotensis , the degree to which each population was affected varied slightly. Across fungal treatments and nematode populations, the fungus reduced total number of nematodes in roots by 61–98%, with the highest for NYG and RI, intermediate for NYL and CT, and lowest for MI and WI populations. The study demonstrated that H. minnesotensis may be used as a potential suppressor of M. hapla in vegetable production systems in the Great Lakes Region.

Keywords: Biological control agent; Hirsutella minnesotensis; Meloidogyne hapla; methyl bromide alternatives; nematophagous fungus; root-knot nematode

Document Type: Research Article


Affiliations: 1: TUBITAK-NATO Visiting Scholar from Ondokuz Mayis University, Samsun, Turkey 2: University of MinnesotaSouthern Research and Outreach Center, Waseca, MN, USA 3: Department of Entomology, Michigan State University, East Lansing, MI, USA

Publication date: January 1, 2006

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